Animals that adapt behaviorally may evolve physically more slowly, showing resilience rather than weakness in changing ...

Instinct / Charles Darwin -- Introduction / George C. Romanes -- Introduction / E. L. Thorndike -- What is behaviorism? / J. B. Watson -- Critique of Konrad Lorenz's theory of instinctive behavior / ...

It is not unusual for laboratory monkeys to engage in abnormal repetitive behaviors (ARBs), such as pacing and hair-plucking.